Helium isotopic composition of hydrothermal fluids from the Manus back-arc Basin, Papua New Guinea

E. Fourre; Philippe Jean-Baptiste; J. L. Charlou; J. P. Donval; J. I. Ishibashi

doi:10.2343/geochemj.40.245

Helium isotopic composition of hydrothermal fluids from the Manus back-arc Basin, Papua New Guinea

E. Fourre, Philippe Jean-Baptiste, J. L. Charlou, J. P. Donval, J. I. Ishibashi

Material Science of Solar Planets

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18 Citations (Scopus)

Abstract

We present isotopic analysis of helium in hydrothermal fluids from the Manus back-arc basin, collected during the French-Japanese Manusflux and Manaute cruises in 1995 and 2000, respectively. The helium isotope composition of the fluids is comparable to that measured elsewhere in similar subduction environments, with ³He/⁴He values (7.4 to 7.9 R_a) slightly lower than typical MORB values, except on the Manus Spreading Center (MSC) where higher values (12 ± 0.1 R_a) are observed. The causal link between the narrow spatial extent of the ³He/⁴He anomaly at the MSC and a ³He-rich deep mantle component remains elusive, based on available geophysical data. Thus, the Manus Spreading Center results may be an interesting example of small scale upper-mantle heterogeneity.

Original language	English
Pages (from-to)	245-252
Number of pages	8
Journal	GEOCHEMICAL JOURNAL
Volume	40
Issue number	3
DOIs	https://doi.org/10.2343/geochemj.40.245
Publication status	Published - 2006

All Science Journal Classification (ASJC) codes

Geophysics
Geochemistry and Petrology

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abstract = "We present isotopic analysis of helium in hydrothermal fluids from the Manus back-arc basin, collected during the French-Japanese Manusflux and Manaute cruises in 1995 and 2000, respectively. The helium isotope composition of the fluids is comparable to that measured elsewhere in similar subduction environments, with 3He/4He values (7.4 to 7.9 Ra) slightly lower than typical MORB values, except on the Manus Spreading Center (MSC) where higher values (12 ± 0.1 Ra) are observed. The causal link between the narrow spatial extent of the 3He/4He anomaly at the MSC and a 3He-rich deep mantle component remains elusive, based on available geophysical data. Thus, the Manus Spreading Center results may be an interesting example of small scale upper-mantle heterogeneity.",

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AU - Fourre, E.

AU - Jean-Baptiste, Philippe

AU - Charlou, J. L.

AU - Donval, J. P.

AU - Ishibashi, J. I.

PY - 2006

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AB - We present isotopic analysis of helium in hydrothermal fluids from the Manus back-arc basin, collected during the French-Japanese Manusflux and Manaute cruises in 1995 and 2000, respectively. The helium isotope composition of the fluids is comparable to that measured elsewhere in similar subduction environments, with 3He/4He values (7.4 to 7.9 Ra) slightly lower than typical MORB values, except on the Manus Spreading Center (MSC) where higher values (12 ± 0.1 Ra) are observed. The causal link between the narrow spatial extent of the 3He/4He anomaly at the MSC and a 3He-rich deep mantle component remains elusive, based on available geophysical data. Thus, the Manus Spreading Center results may be an interesting example of small scale upper-mantle heterogeneity.

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